text: #!/usr/bin/env node
  
  /**
   * Module dependencies.
   */
  
  import debug from 'debug'
  import http from 'http'
  import dayjs from 'dayjs'
  import Slack from 'slack-node'
  
  import '../env/env'
  import app from '../app'
  import { logger } from '../configs/winston'
  
  debug('lunacat-api:server')
  
  /**
   * Get port from environment and store in Express.
   */
  
  const port = normalizePort(process.env.PORT || '3000')
  app.set('port', port)
  
  /**
   * Create HTTP server.
   */
  
  const server = http.createServer(app)
  
  /**
   * Listen on provided port, on all network interfaces.
   */
  
  server.listen(port)
  server.on('error', onError)
  server.on('listening', onListening)
  server.on('close', onClose)
  process.on('uncaughtException', err => {
    logger.error(`***UNCAUGHT EXCEPTION: ${err}`)
  
    if (process.env.NODE_ENV !== 'test') {
      const slack = new Slack()
      const errorObjectForSlack = {
        timestamp: dayjs(new Date()).format('YYYY-MM-DD HH:mm:ss Z'),
        message: err.message,
        statusCode: err?.status,
        stack: err?.stack,
      }
  
      slack.setWebhook(process.env.SLACK_WEBHOOK)
      slack.webhook(JSON.stringify(errorObjectForSlack), webhookError => {
        if (webhookError) logger.error(`[SlackWebhookError] ${webhookError}`)
      })
    }
  
    process.exit(1)
  })
  /**
   * Normalize a port into a number, string, or false.
   */
  
  function normalizePort(val) {
    const normalizedPort = parseInt(val, 10)
  
    if (Number.isNaN(normalizedPort)) {
      // named pipe
      return val
    }
  
    if (normalizedPort >= 0) {
      // port number
      return normalizedPort
    }
  
    return false
  }
  
  /**
   * Event listener for HTTP server "error" event.
   */
  
  function onError(error) {
    logger.error(error)
  
    if (error.syscall !== 'listen') {
      throw error
    }
  
    const bind = typeof port === 'string' ? `Pipe ${port}` : `Port ${port}`
  
    // handle specific listen errors with friendly messages
    switch (error.code) {
      case 'EACCES':
        console.error(`${bind} requires elevated privileges`)
        process.exit(1)
        break
      case 'EADDRINUSE':
        console.error(`${bind} is already in use`)
        process.exit(1)
        break
      default:
        throw error
    }
  }
  
  /**
   * Event listener for HTTP server "listening" event.
   */
  
  function onListening() {
    const addr = server.address()
    const bind = typeof addr === 'string' ? `pipe ${addr}` : `port ${addr.port}`
    debug(`Listening on ${bind}`)
  }
  
  function onClose() {
    server.close()
  }
  